Re: lightweight tent
Seeing you're on this side of the pond, take a look at Terra Nova. I have a Laser Competition 1. They also do a 2 (2 person). The tiny titanium skewer pegs are super light, but a pain in the arse. Get some good quality 'v' pegs and your set up for everything. They're similar in look and design to the Hilleberg, but considerably cheaper and still top quality. Light and compact too.
Me and my labrador spent 9 days in mine a couple of weeks ago. The 1 is advertised as a 1+. I wouldn't have wanted another person in it, but at a push you could do it (she's a small lab).
Don't buy direct from the company though, as you will find them at deal prices. Got mine from Field and Trek.
Cheers
Jon